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From "Jitendra Nath Pandey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12420) Disable Namenode format when data already exists
Date Wed, 13 Sep 2017 18:00:02 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12420?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16165043#comment-16165043
] 

Jitendra Nath Pandey commented on HDFS-12420:
---------------------------------------------

In spite of the -force option or the prompt for Y/N, admins do make mistakes and end up loosing
data. In a real production cluster with real data, why would someone want to do a format?
In dev/qa clusters, I can see the need for format. Another option is to configure the cluster
as "production" mode, where format will not be allowed. Dev/test clusters can be configured
with 'dev' mode, where format is allowed. 

> Disable Namenode format when data already exists
> ------------------------------------------------
>
>                 Key: HDFS-12420
>                 URL: https://issues.apache.org/jira/browse/HDFS-12420
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Ajay Kumar
>            Assignee: Ajay Kumar
>         Attachments: HDFS-12420.01.patch, HDFS-12420.02.patch
>
>
> Disable NameNode format to avoid accidental formatting of Namenode in production cluster.
If someone really wants to delete the complete fsImage, they can first delete the metadata
dir and then run {code} hdfs namenode -format{code} manually.



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